Thermoluminescence characterization of Dy3+‐activated Mg5(BO3)3F low Zeff phosphor

Thermoluminescence characteristics of Dy³⁺‐activated Mg₅(BO₃)₃F low Z_eff phosphor are described. The Mg₅(BO₃)₃F phosphor doped with Dy³⁺ as activator was prepared by the modified solid‐state reaction. Formation of the compound was confirmed by use of X‐ray powder diffraction. The X‐ray powder diffraction pattern of the as‐prepared compound shows a good match with the available JCPDS data. The γ‐irradiated Mg₅(BO₃)₃F:Dy³⁺ phosphor shows a simple glow curve peaking at about 148°C indicating that only one type of trap is being activated within a particular temperature range. The kinetic parameters, including activation energy and frequency factor were determined using Chen's method. The activation energy and frequency factors were 0.75 eV and 4.508 × 10⁹/s respectively. The Z_eff of Mg₅(BO₃)₃F:Dy³⁺ phosphor was 9.84. Copyright © 2012 John Wiley & Sons, Ltd.